Antonella Artuso, Queen's Park Bureau Chief

TORONTO — Ontario opposition parties will press for the return of key players in the alleged plan to wipe computer hard drives in the office of former premier Dalton McGuinty.

NDP MPPs — who walked out of the Ontario legislature Monday to protest the absence of Premier Kathleen Wynne — said the party intends to pursue a Speaker's warrant for Peter Faist, if needed, to bring him before a government committee investigating the possible destruction of public records related to the cancellation of two gas plants.

"There are still a lot of unanswered questions about the gas plant scandal coverup and the people of this province deserve the answers, so we're going to continue to dig," NDP Leader Andrea Horwath said Tuesday.

It was the Progressive Conservatives who put Faist on their list of witnesses to testify at committee.

Tory MPP Lisa MacLeod said the PCs will continue to pursue this issue even as she and her party's leader, Tim Hudak, face possible legal action from Wynne.

"The fact that the premier wants to stop us from doing our jobs speaks more about her than it does, I think, about us," MacLeod said.

"And therefore, we're going to continue to ask the tough questions whether the government likes that or not."

Wynne has complained about Hudak's allegations that she may have overseen the destruction of documents, noting she was not even in the premier's office during the alleged activity.

An Ontario Provincial Police warrant makes accusations — unproven in court — that Faist was brought in by McGuinty's former chief of staff to wipe 24 hard drives.

The OPP have yet to say if an investigation of the hard drives confirmed the allegations.